Table 1. Baseline descriptives for persons at risk of a first time meniscal lesion.

Copenhagen Airport Cohort, by baggage handlers and referents.

		Baggage handlers		Reference group
Register based factors1		n	%	n	%
Total participants		3,307	100	63,934	100
Age	<30	2,044	62	29,605	46
	30–44	1,151	35	20,597	32
	45–59	110	3	9,888	15
	60+	2	0	3,844	6
Educational level	Elementary school	1,511	46	36,396	57
	High school	426	13	8,314	13
	Vocational education	1,229	37	16,013	25
	Higher education	141	4	3,211	5
Pre-employment knee trauma		172	5	2,149	3
Self-reported factors, survey 2012
Total participants		1,703	100	1,909	100
Body mass index	<18.5	1	0	9	0
	18.5–24.9	576	34	672	36
	25–29.9	826	49	871	46
	30.0+	280	17	325	17
Smoking	Never	650	38	654	34
	Past	581	34	656	35
	Current	459	27	588	31
Alcohol (units of 12 grams per week)	None	413	25	494	26
	1–21	1,191	71	1,272	67
	>21	78	5	125	7
Physical activity in leisure time	Sendentary	164	10	248	13
	Low	599	36	677	36
	Medium	685	41	691	37
	High	234	14	269	14

¹ Descriptive statistics for the first year during follow-up that a person was a baggage handler, or first year during follow-up for workers who were never a baggage handler (reference group).